And what is that wherein Dasein as Being-in-the-world understands itself pre-ontologically? In understanding a context of relations such as we have mentioned, Dasein has assigned itself to an "in-order-to" [Um-zu], and it has done so in terms of a potentiality-for-Being for the sake of which it itself is—one which it may have seized upon either explicitly or tacitly, and which may be either authentic or inauthentic. This "in-order-to" prescribes a "towards-this" as a possible "in-which" for letting something be involved; and the structure of letting it be involved implies that this is an involvement which something has—an involvement which is with something. Dasein always assigns itself from a "for-the-sake-of-which" to the "with-which" of an involvement; that is to say, to the extent that it is, it always lets entities be encountered as ready-to-hand.2 That wherein [Worin] Dasein understands itself beforehand in the mode of assigning itself is that for which [ das Woraufhin] it has let entities be encountered beforehand. The "wherein" of an act of understanding which assigns or refers itself, is that for which one lets entities be encountered in the kind of Being that belongs to involvements; and this "wherein" is the phenomenon of the world. 3 And the structure of that to which [woraufhin] Dasein assigns itself is what makes up the worldhood of the world.
That wherein Dasein already understands itself in this way is always something with which it is primordially familiar. This familiarity with the work does not necessarily require that the relations which are constitutive for the world as world should be theoretically transparent. However, the possibility of giving these relations an explicit ontologico-existential Interpretation, is grounded in this familiarity with the world; and this familiarity, in turn, is constitutive for Dasein, and goes to make up Dasein's understanding of Being. This possibility is one which can be seized upon explicitly in so far as Dasein has set itself the task of giving a primordial Interpretation for its own Being and for the possibilities of that Being, or indeed for the meaning of Being in general.
2 'Dieses zeichnet ein Dazu vor, als mögliches Wobei eines Bewendenlassens, das strukturmässig mit etwas bewenden lässt. Dasein verweist sich je schon immer aus einem Worum-willen her an das Womit einer Bewandtnis, d. h. es lässt je immer schon, sofern es ist, Seiendes als Zuhandenes begegnen.'
3 'Das Worin des sichverweisenden Verstehens als Woraufhin des Begegnenlassens von Seiendem in der Seinsart der Bewandtnis ist das Phänomen der Welt.'